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<div class="title">samples/cpp/minarea.cpp</div>  </div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&quot;</span></div><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&quot;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> help()</div><div class="line">{</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;This program demonstrates finding the minimum enclosing box, triangle or circle of a set\n&quot;</span></div><div class="line">         &lt;&lt; <span class="stringliteral">&quot;of points using functions: minAreaRect() minEnclosingTriangle() minEnclosingCircle().\n&quot;</span></div><div class="line">         &lt;&lt; <span class="stringliteral">&quot;Random points are generated and then enclosed.\n\n&quot;</span></div><div class="line">         &lt;&lt; <span class="stringliteral">&quot;Press ESC, &#39;q&#39; or &#39;Q&#39; to exit and any other key to regenerate the set of points.\n\n&quot;</span>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> <span class="comment">/*argc*/</span>, <span class="keywordtype">char</span>** <span class="comment">/*argv*/</span> )</div><div class="line">{</div><div class="line">    help();</div><div class="line"></div><div class="line">    <a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> img(500, 500, <a name="a1"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>, <a name="a2"></a><a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0));</div><div class="line">    <a name="_a3"></a><a class="code" href="../../d1/dd6/classcv_1_1RNG.html">RNG</a>&amp; rng = <a name="a4"></a><a class="code" href="../../d2/de8/group__core__array.html#ga75843061d150ad6564b5447e38e57722">theRNG</a>();</div><div class="line"></div><div class="line">    <span class="keywordflow">for</span>(;;)</div><div class="line">    {</div><div class="line">        <span class="keywordtype">int</span> i, count = rng.<a name="a5"></a><a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(1, 101);</div><div class="line">        vector&lt;Point&gt; points;</div><div class="line"></div><div class="line">        <span class="comment">// Generate a random set of points</span></div><div class="line">        <span class="keywordflow">for</span>( i = 0; i &lt; count; i++ )</div><div class="line">        {</div><div class="line">            <a name="_a6"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point</a> pt;</div><div class="line">            pt.<a name="a7"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a4c96fa7bdbfe390be5ed356edb274ff3">x</a> = rng.<a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(img.<a name="a8"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a>/4, img.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#aa3e5a47585c9ef6a0842556739155e3e">cols</a>*3/4);</div><div class="line">            pt.<a name="a9"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html#a157337197338ff199e5df1a393022f15">y</a> = rng.<a class="code" href="../../d1/dd6/classcv_1_1RNG.html#acde197860cea91e5aa896be8719457ae">uniform</a>(img.<a name="a10"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a>/4, img.<a class="code" href="../../d3/d63/classcv_1_1Mat.html#abed816466c45234254d25bc59c31245e">rows</a>*3/4);</div><div class="line"></div><div class="line">            points.push_back(pt);</div><div class="line">        }</div><div class="line"></div><div class="line">        <span class="comment">// Find the minimum area enclosing bounding box</span></div><div class="line">        <a name="_a11"></a><a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point2f</a> vtx[4];</div><div class="line">        <a name="_a12"></a><a class="code" href="../../db/dd6/classcv_1_1RotatedRect.html">RotatedRect</a> box = <a name="a13"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga3d476a3417130ae5154aea421ca7ead9">minAreaRect</a>(points);</div><div class="line">        box.<a name="a14"></a><a class="code" href="../../db/dd6/classcv_1_1RotatedRect.html#a69d648b086f26dbce0029facae9bfb2d">points</a>(vtx);</div><div class="line"></div><div class="line">        <span class="comment">// Find the minimum area enclosing triangle</span></div><div class="line">        vector&lt;Point2f&gt; <a name="a15"></a><a class="code" href="../../d9/db7/group__datasets__gr.html#gga610754124ced68d1f05760b5948fbb76a26c349619f95531945f6c0c7a24dedea">triangle</a>;</div><div class="line">        <a name="a16"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga1513e72f6bbdfc370563664f71e0542f">minEnclosingTriangle</a>(points, triangle);</div><div class="line"></div><div class="line">        <span class="comment">// Find the minimum area enclosing circle</span></div><div class="line">        <a class="code" href="../../db/d4e/classcv_1_1Point__.html">Point2f</a> center;</div><div class="line">        <span class="keywordtype">float</span> radius = 0;</div><div class="line">        <a name="a17"></a><a class="code" href="../../d3/dc0/group__imgproc__shape.html#ga8ce13c24081bbc7151e9326f412190f1">minEnclosingCircle</a>(points, center, radius);</div><div class="line"></div><div class="line">        img = <a class="code" href="../../d1/da0/classcv_1_1Scalar__.html#ac1509a4b8454fe7fe29db069e13a2e6f">Scalar::all</a>(0);</div><div class="line"></div><div class="line">        <span class="comment">// Draw the points</span></div><div class="line">        <span class="keywordflow">for</span>( i = 0; i &lt; count; i++ )</div><div class="line">            <a name="a18"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670">circle</a>( img, points[i], 3, <a name="a19"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 255), <a name="a20"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a89c5f6beef080e6df347167f85e07b9e">FILLED</a>, <a name="a21"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a> );</div><div class="line"></div><div class="line">        <span class="comment">// Draw the bounding box</span></div><div class="line">        <span class="keywordflow">for</span>( i = 0; i &lt; 4; i++ )</div><div class="line">            <a name="a22"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>(img, vtx[i], vtx[(i+1)%4], <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 255, 0), 1, <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a>);</div><div class="line"></div><div class="line">        <span class="comment">// Draw the triangle</span></div><div class="line">        <span class="keywordflow">for</span>( i = 0; i &lt; 3; i++ )</div><div class="line">            <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga7078a9fae8c7e7d13d24dac2520ae4a2">line</a>(img, triangle[i], triangle[(i+1)%3], <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(255, 255, 0), 1, <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a>);</div><div class="line"></div><div class="line">        <span class="comment">// Draw the circle</span></div><div class="line">        <a class="code" href="../../d6/d6e/group__imgproc__draw.html#gaf10604b069374903dbd0f0488cb43670">circle</a>(img, center, <a name="a23"></a><a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(radius), <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 255, 255), 1, <a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a>);</div><div class="line"></div><div class="line">        <a name="a24"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>( <span class="stringliteral">&quot;Rectangle, triangle &amp; circle&quot;</span>, img );</div><div class="line"></div><div class="line">        <span class="keywordtype">char</span> key = (char)<a name="a25"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>();</div><div class="line">        <span class="keywordflow">if</span>( key == 27 || key == <span class="charliteral">&#39;q&#39;</span> || key == <span class="charliteral">&#39;Q&#39;</span> ) <span class="comment">// &#39;ESC&#39;</span></div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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